Mop



FIG. 1 is a rear left perspective view of a mop, wherein the remainder of the mop is unclaimed and omitted for clarity;

FIG. 2 is a front view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left view thereof; and,

FIG. 5 is a rear view thereof.

The dot-dash-dot broken line showing represents unclaimed boundaries of the claimed design. The dot-dot broken line showing represents environmental structure and forms no part of the claimed design. 

The ornamental design for a mop, as shown and described. 